Quoting Aero145 (Reply 5):Going to try this again if I can get a 1.4x... cropped a lot from 200mm

David i think when your panning your focus point is moving as the aircraft is moving along but not focusing on the entire image .
You might know this already but try this next time your out.
1- All points focus not only on center point.
2- Use the servo mode on the camera that will help you achieve continuous focus as your panning.
Cool shots by the way.
Cheers